Fan and method of making same



April 18, 1939 A. B. HUVBBARD ET AL 2,155,231

- Filed June 1, 1956 I 2 Sheets-Sheet 1 Albert BHubbard, v

MyesSta ton,

' Inventors.

; b-JV Th ei: Attorney.

April 18, 1939- A B. HUBBARD ET AL- 2,155,231 FAN AND METHOD OF MAKING SAME I 2 Sheets-Sheet 2 Filed June 1, 1936 Ifivntors:

Albert EmHubbard, Myies Stanton,

. 55 the hub l2. To prevent relative movemenxt be- Patented Apr. 18,- 1939 Um'rso STATES PATENT 1 OFFICE 7 FAN AND MAKING SAME I Albert B. Hubbard and Myles Stanton, Bloomiield, N; 1., assignors to General Electric Company, .a corporation of New York I Application June 1,1936, Serial No. 82,821

'14 Claims. (01. 29-1563) Our invention relates to a fan and more particularly to a fan construction and assembly.

' An object of our invention is to provide an improved fan which is .of low cost of manufaction will be better understood by reference to the following specification and appendedclaims when considered in connection with the accompanying drawings, in which Fig. lis a perspective view of a double fan wheel embodying our improved construction; Fig. 2 is a perspective view of a'single fan'wheeh-Fig. 3 is a perspective view of the hub and two fan blades; Fig. 4 is a side sectional view through the hub showing two of theblades assembled thereon; Fig. 5 is a side view of a double fan with parts cut away to show the assembled relationship; tail sectional view'of a part of the assembly: Fig. '7 is a sectional view of a. single fan wheel; Fig. 8 isa detail end view of a part of the fan of Fig.7, and Fig. 9 is a detail end view of the hub 'end of the fan of Fig. '1. Referring to the drawings, Iii indicates a dou ble fan wheel having a plurality of blades H; extending axially from one side, of a hub l2 and a plurality of blades I3 extending from the other side of the hub. Referringto Fig. Lit may be seen that blades II have integral feet l4 and inr 15. Similarly, blades sections l'l.

tegral shroud it have feet ring sections it and shroud ring ections 20 which extend into groove l6 have projections 2! which extend into groove i9. 'Feet M have segmental radial'sections 22 'whiclr are in abutting relation with adjacent sec- I tions 22 and extend toengage one face of hub i2. Also, feet 46 are provided withsegmental sections 23. The blades II and i3 are located alternately around the periphery of hub i2 and are secured to hub l2 bymeans of a wire binding 24 which is wound tightly over feet I4 and i6 overlying the periphery of hub' l2 Adjacent turns of wire 24 are soldered predetermined tension to form a unitary binding structure. To prevent the wires 24 from unwinding before they are soldered, clips 25 are provided. If the fan wheels are. rotated at a higher speed than their normal operating speed, there may be a tendency for the blades to stretch the binding wires 24 due to the centrifugal forces loose on the hub I2. In such a tlle'blades would tendto rotate or slide about Fig.6isade-' Y which extend together under v this modified tween the blades I i and i3 and hub 12, one 'of the blades is secured against relative rotary movement by. means of a pin 26 which may be seen by reference blades secured to the hub 12 by means of pin 26, it is impossible for the other blades to move around the periphery of the hub so it is not necessary to secure each of the blades individually to the hub. Toinsure the proper fitting and positioning of the blades, the projections 20 and 2| are made somewhat smaller than the grooves 18 and i9 and the feet M and 6,are of sucha length as to provide a clearance between their ends and the segmentalsections 23 ahd'22 respectively of the blades l3 and H. By this arrangement the binding wire 24 holds the blades H and. I3 in tight engagement'with the periphery of the hub l2 and with the segmental sections 22 and 23 in close engagement with the opposite faces'of the hub l2. Shroud ring sections i5 and I1 nest togather to form continupus shroud rings. Shroud ring section i5 is provided with projections 21 into corresponding recesses provided in' the adjacent shroud ring section l5. Similarly, shroud ring section I! is provided with 28. To assist in securing the blades respectively. Clips 3! and 32 are provided to prevent wires 2-9 and from' unwinding.- In Figs. 5 and 6 it may be feet- II and P6 are mounted on the hub l2 and secured thereto by means of wire 24 and prevented from relative rotation by means of the pin '26. In Fig. 5 the relation of the shroud ring sections .l5 with their projections 21 and securing means consisting of wire 29 serve to form a rigid'structure. In Fig. 2 a single fan wheel is shown identical in construction to the right-hand fan wheel of blades libeing secured to hub thus left between the adjacent feet It but this does notafiect the rigidity of the fan wheel as the segmental sections 23 are in abutting relation. In Figs. 7, 8 and 9 a. modifled'construction of single wheel is shown. In construction the blade has a abuts the-foot 34 of adjacent'blade its length so that only a single set of blades can be mounted on the hub 35. This form of construction is desirable for larger. diameter fans. In Figs. '7 and 9 it may be seen that two projections .36 are provided on one side of foot 34 and one projection 36 an the opposite side. These projections 36 serve to. space the blades "33 uniiormly aroundthe to Figs. 4 and 6. With one of the seen how the alternate I shroud ring sections of hub l2,

periphery of hub 35 and distribute the clearance which must be provided in the blade assembly between adjacent-blades to allow for, some variation or tolerance in the blade widths. when the blades 33 are secured tothe hub by means of binding wire 31 the projections 36 are} crushed until the foot 34 tightly embraces the outer periphery of hub 35 and distributes the clearance between the feet 34 equally among the blades 33. In the manufacture of the fan wheel, the hub I2 is cast and machined and theblades -II and I! are cast with the integral-feet l4 and i6 and I5 and I1. The blades Ii and I! are then mounted around the periphery one of the blades being securedto the hub by-means of a pin 26. [The blades II and i3 v ciently to cause the wound around the feet i4 and 1| and, 32 arethen put on in are then clampedto the hub l2v with the faces of segmental sections 22 and 23 abutting opposite faces of the'hub l2. The wire 24 is then secured at one end and wound under a predetermined tension around the feet I4 and II, the clips 25 inserted as the wire progresses around the periphery of hub l2. A tinned phospho'r bronze or stainless steel wire 24 is used so that when the winding operation has been completed the adjacent turns may bereadily soldered v together. The clips 2! are turned down before the adjacent turns are soldered. The tension; which is used is determined by the normal'operating speed of the fan and is made such that it will resist the centrifugal forces atsuch speed so the fan blades will notbecome loose on hub l2. At a higher speed the wire will-stretch sumblades to loosen. If this predetermined tension were not used then the blades would begin to loosen on the hub l2 as soon as the wheel began to rotate. The wire 24 may be I! either by rotating the wheel-or by rotating the winding means. The wire bindings 29 and 30 and clips the same manner as binding 24. The assembly of the single wheels of Figs. 2 and 'l is the same as the assembly of the double wheel as above described. After the wheels have been assembled, it is necessary to balance them. 'Ihe positions at which weights must belocated are first determined. In the case mines the weight that is point The single wheel I balanced by'the application of weights in the of the'double wheel of Fig. 1 the weights are applied on thewire bindings 2! and 30 of shroud 1 ring sections at 38 and it in the form of solder.-

The solder is flowed on the wire bindings 29 and V II in a practically uniform ayer and the length of wire over whichv the solder is applied 'deterf of Fig. 2 is similarly form of solder to the wire 40 and respectively. single wheel the weights are added at the hub bindings 24 and 30' at and at the shroud ring sections. In this manner ing' from one side the balancing of the wheels is accomplished accurately with greater facility than co'uld'be possible by the addition of other weights at different locations.

Fromthe foregoing it maybe-seen that the" fan wheel is formed .of a minimum number of integralparts which are assembled and. rigidly secured together in a simple and expeditious manner. g What we claim asnew'and desire to secure by Letters Patentof the United Btatesis: 3 1. In combination, a hub, fan blades extending axially fromthe hub and having abutting portions overlying the periphery of the hub and a .wire wound over the abutting portions of the over the portions of being added at this Thus'inthecaseofthe I from the opposite lying the periphery of the hubto secure the;

blades to the hub.

v 3. In combination. axially from the hub lying the periphery a hub, fan blades extending and having portions overof the hub, a wire wound the blades overlying the periphery of'the hub to secure the-blades to the hub, and clips securing the adjacent turns of wire together to prevent them from unwinding. I 4. In combinatio a hub, fan blades extending axially from theflhub and having portions overlying the periphery of the hub, and wire wound over the portions of the blades overlying the periphery of the hub-to secure the blades tothe hub, the adjacent turns of said wire being sol dered together.

In combination, a hub, fanblades extending axially from the hub and having shroud ring sections which when assembled form a substantially continuous ring, and integral feet, said feet'overlying the periphery of the hub, and wire wound over the feet. to secure the blades to the hub. g

6. In combination, a hub, fan blades extending and having integral feet and said feet overlying the pewire wound over the feet to axially from the hub shroud ring sections, riphery. of the hub, secure the blades to over the shroud ring cure the blades together.

the hub, and wire wound 7. In combination, :a hub, fan blades extending axially from the hub and having portions overlying the periphery of the hub, a'wire wound under tension over the portions of the blades overlying the periphery of the hub to secure the blades to the hub, and a pin, Securing one of said blades to the hubto prevent relative rotary movement between the blades and hub.

8. In combination, a hub, fan blades having integral feet and shroud sections of said feet'abutting'the' feet of adjacent blades andhavingproiections to distribute the clearance between blades equally among the blades, and a wire wound under tension over the.

feet to secure the blades to the hub.

9. In combination, alternately in anjaxialdirection from opposite sides of the hub having portions periphery of the'hub. and a wire wound over the portions of the blades overlying the-periphery of v the hub to secure the blades to the hub:

10'. In combination, a hub; fan blades extendand shroud ring sections, fan blades extending side of the hub from said first mentioned fan blades and integral feet and shroud ring sections,the feet of said fan blades extendingfrom opposite alternately around the periphery offthe hub, v a pin securing one of said blades wound over the feet of all the fan blades to secure the blades to'the hub; and additional wires wound over the shroud ring sections of'thejblades ex tending from both sides-of the idly secure the blades together.

11. The method of manufacturing a fan'wheel which consists inmounting the fan,blades on the ring sections, said feet overlying theperipheryxof the hub, segmental overlying the r the hub having integral feet J sides and located sectionsto more rigidly sea hub, fan blades extending to the hub. a wire hub to more hub and extending axially therefrom with a por-. tion overlying the periphery of the hub, clamp ing the fan blades to the hub, winding a wire under tension over the portion of the blades overlying the periphery of the hub, and soldering the adjacent turns of wire together.

\ 12. The method of manuiaoturinga tan wheel which consists in mounting blades having toot members on a hub with the foot members overlying 'the outer periphery of the hub; clamping the ian'blades to the hub, securing one of the fan blades to movement by means of a pin, winding a wire over clamping the fan blades on foot members overlying the outer periphery of the blades and hub, winding a wire the hub against relative rotarywhich consists 'inmounting fan blades having toot members and shroud ring sections on a hub;

the hub with the the hub and the shroud ring sections of adjacent blades abutting, pinning one 0! the blades to the hub to prevent. relative rotary movement between der tension over the foot members, soldering adjacent turns ofv wire sion, and soldering the adjacent turns of wire of the last mentioned binding together.

14. In a fan, axially extending blades having abutting sections providing a shroud ring. and tension means wrapped around said sections and I together, winding a wire binding over the shroud ring sections under ten-- bindin unexerting a compressive force toward the axis of the tan securing the blades together.

ALBERT B. HUBBARD MYLES STANTON. 

